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arXiv 0705.1554astro-ph
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短持续时间伽马射线暴甚高能辐射的Milagro约束

Milagro Constraints on Very High Energy Emission from Short Duration Gamma-Ray Bursts

A. A. Abdo, B. T. Allen, D. Berley, E. Blaufuss, S. Casanova, B. L. Dingus, R. W. Ellsworth, M. M. Gonzalez, J. A. Goodman, E. Hays, C. M. Hoffman, B. E. Kolter… 展开作者

A. A. Abdo, B. T. Allen, D. Berley, E. Blaufuss, S. Casanova, B. L. Dingus, R. W. Ellsworth, M. M. Gonzalez, J. A. Goodman, E. Hays, C. M. Hoffman, B. E. Kolterman, C. P. Lansdell, J. T. Linnemann, J. E. McEnery, A. I. Mincer, P. Nemethy, D. Noyes, J. M. Ryan, F. W. Samuelson, P. M. Saz Parkinson, A. Shoup, G. Sinnis, A. J. Smith, G. W. Sullivan, V. Vasileiou, G. P. Walker, D. A. Williams, X. W. Xu, G. B. Yodh

摘要:

最近,雨燕和HETE卫星对短而硬的伽马射线暴(GRB)的快速定位,导致了对第一次余辉的观测和对这种类型暴的第一次红移的测量。探测到大于100 GeV的对应物将对GRB机制产生强大的限制。2000年1月至2006年12月期间,在米拉格罗伽马射线观测站的视野内发生了17次由卫星探测到的短持续时间(< 5 s)伽马射线暴。我们已经搜索了Milagro的数据,以寻找这些GRB的>100 GeV对应物,并没有发现与这些爆发相关的显着发射。由于高能伽马射线被河外背景光(EBL)吸收,因此只能在红移小于~0.5时探测到。虽然大多数长持续时间的伽玛暴发生在红移高于0.5,相反的是被认为是正确的短伽玛暴。因此,检测到的VHE信号的缺乏允许设置有意义的注量限制。样本中的一个伽玛暴(050509 b)可能与一个红移为0.225的星系有关,而另一个(051103)则暂时与附近的星系M81有关。对于EBL吸收,可以使用已知的测量红移,或者计算红移为0.1和0.5以及z=0的情况下的相应吸收来校正通量限制。

英文摘要:

Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led to the observation of the first afterglows and the measurement of the first redshifts from this type of burst. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Seventeen short duration (< 5 s) GRBs detected by satellites occurred within the field of view of the Milagro gamma-ray observatory between 2000 January and 2006 December. We have searched the Milagro data for >100 GeV counterparts to these GRBs and find no significant emission correlated with these bursts. Due to the absorption of high-energy gamma rays by the extragalactic background light (EBL), detections are only expected for redshifts less than ~0.5. While most long duration GRBs occur at redshifts higher than 0.5, the opposite is thought to be true of short GRBs. Lack of a detected VHE signal thus allows setting meaningful fluence limits. One GRB in the sample (050509b) has a likely association with a galaxy at a redshift of 0.225, while another (051103) has been tentatively linked to the nearby galaxy M81. Fluence limits are corrected for EBL absorption, either using the known measured redshift, or computing the corresponding absorption for a redshift of 0.1 and 0.5, as well as for the case of z=0.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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